I want to push my stock 18s out a bit. I've seen some of you guys have done this mod. Is it 5mm in front and 7mm out back? 5mm all around? or what?

Also, from where did you source your spacers and the longer bolts (how long?) and the cost?

Thanks!!

 

for a stock wheel, go 15mm all around. Here is 285 rear and 225 fronts

 

Awesome!! Thank you.

 

call these guys - they're great to work with...

http://www.wheelenhancement.com/index.php?t=AccSpacers

 

For the NB 996 I believe that the factory recommended optional 17mm spacers for the rear and 5mm for the front. That would make your rears effectively an ET 48 with the stock 18x10 ET 65

 

I don't know what that means. What is ET?

 

It means offset. try your search function. hit google for "offset calculator" and you will learn some valuable info.

from the internet...

What does OFFSET (et) mean?

Your car requires a unique offset. This is where the wheel will sit in relation to the bodyline of the vehicle, realistically you can go 5-7mm outside these recommendations, but always consult a technician if you are unsure, as there are often other factors that need to be considered. Offset is usually stamped on the wheel and is measured in millimetres of et (et is the short form of the German word 'Einpresstiefe' which literally translates as insertion depth).

 

Wow, the things I learn on this board! I didn't even know there was a factory rec. So it's 17mm rear, and 5mm front as per factory rec? Cool. Thanks!!

 

would you have a rubbing issue with the 17mm spacer in tha back??

 

what size are your tires, if you have 285 in the rear 17mm is to big, look at my pics in post 2. thats 15mm and its right on the edge... for 265 your fine, but why not wider tires, there better.
5mm up front is a waste, again look at my pics, 225 up front (stock size) and I have 15mm up there, not even close to the edge and plenty of room, probably even with 235

 

5mm is good for fine tuning. if u really want to see the difference u'll need thicker than 5mm.

 

Wheel offset is soooo subjective...some lik ethe tier flush with the fender or slightly outside, some like it just on the inside of the fender, some have lowered cars with more camber in the wheels and the tires "appear" to be in farther, etc...so my suggestion. Look at LOTS of pics of peoples cars from lots of angles...then aske them the wheel size and offset and if they run a spacer....then reverse engineer the math to figure out how to get that look with you wheels...I think 15mm or 17mm may be too much....maybe 10-13mm...that gives you a final offset of 52-55mm....

 

what is the impact on understeer/oversteer if your rear spacers are greater than your front spacers?

 

Agree with newport. Also, don't go thinking you can run the 17mm rear spacer on a 18x10 ET65 wheel with a biggrer than stock size tire (stock was 265/35 for pre 2002).

Notice that the pics above for Redridge with 15mm spacer and 285s look pretty maxed out for that combo.

 

The factory dials in a good amount of understeer on these cars as delivered from the factory as guided by the Porsche Legal dept...i.e. car goes off the road frontward = understeer = driver error meanwhile car goes off the road backward = oversteer = car error.

I you are going for looks that is subjective and completely up to the individual.

For track handling on the other hand, larger spacers at the rear increase rear track width introducing even more understeer or "push." No spacers at rear and 15mm at front, increasing front track width will begin to dial out a portion of the factory tuned understeer. A good aggressive track alignment will also dial out some of the understeer but only to a point. At that point, as you will see with many members on this board with far more experience than myself, you need to start playing with GT3 sway bars, stiffer springs, adjustable suspensions, etc.

If you type in "understeer" on this board you will find miles of info.